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Message-Id: <20230922133108.2090612-3-lukma@denx.de>
Date: Fri, 22 Sep 2023 15:31:05 +0200
From: Lukasz Majewski <lukma@...x.de>
To: Tristram.Ha@...rochip.com,
Eric Dumazet <edumazet@...gle.com>,
Andrew Lunn <andrew@...n.ch>,
davem@...emloft.net,
Woojung Huh <woojung.huh@...rochip.com>,
Vladimir Oltean <olteanv@...il.com>,
Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Florian Fainelli <f.fainelli@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
UNGLinuxDriver@...rochip.com,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
Vladimir Oltean <vladimir.oltean@....com>,
Lukasz Majewski <lukma@...x.de>,
Florian Fainelli <florian.fainelli@...adcom.com>
Subject: [PATCH v6 net-next 2/5] net: dsa: notify drivers of MAC address changes on user ports
From: Vladimir Oltean <vladimir.oltean@....com>
In some cases, drivers may need to veto the changing of a MAC address on
a user port. Such is the case with KSZ9477 when it offloads a HSR device,
because it programs the MAC address of multiple ports to a shared
hardware register. Those ports need to have equal MAC addresses for the
lifetime of the HSR offload.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Signed-off-by: Lukasz Majewski <lukma@...x.de>
Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
---
Changes for v5:
- New patch
Changes for v6:
- None
---
include/net/dsa.h | 10 ++++++++++
net/dsa/slave.c | 7 +++++++
2 files changed, 17 insertions(+)
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 426724808e76..d98439ea6146 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -969,6 +969,16 @@ struct dsa_switch_ops {
struct phy_device *phy);
void (*port_disable)(struct dsa_switch *ds, int port);
+
+ /*
+ * Notification for MAC address changes on user ports. Drivers can
+ * currently only veto operations. They should not use the method to
+ * program the hardware, since the operation is not rolled back in case
+ * of other errors.
+ */
+ int (*port_set_mac_address)(struct dsa_switch *ds, int port,
+ const unsigned char *addr);
+
/*
* Compatibility between device trees defining multiple CPU ports and
* drivers which are not OK to use by default the numerically smallest
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 2b3d89b77121..4c3e502d7e16 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -457,6 +457,13 @@ static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
+ if (ds->ops->port_set_mac_address) {
+ err = ds->ops->port_set_mac_address(ds, dp->index,
+ addr->sa_data);
+ if (err)
+ return err;
+ }
+
/* If the port is down, the address isn't synced yet to hardware or
* to the DSA master, so there is nothing to change.
*/
--
2.20.1
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